Electric coil



Jan.' 11. 1927- J. LE GAUCEAR `ELECTRIC COIL Filed sept. 2, 1924 .4a f6@ I lll Patented Jan.'11, .1927.

UNITED STATES Leit-30s PATENT orties,

JACQUES LE GAUCEAR, OF CHICAGO, ILLINOLS, ASSIGNOR 0F 0I\`|'EHlAL'lE T0 EDWARD n. Mortensen, or

p'plioeton ,filed September 2, 19E/. Serial No. SSb's are adapted to coact with the ,contacts on the primary and secondary coils The objects ot this invention are to provide an improved electrical coil for rsdio purposes; to provide primary and secondary coils having;- predeterrnined lengths of Windingrs arranged in predetermined relation to each other; to provide a simple and compact device ot this character lwhich is adapted tor use in receiving` sets and which will be particularly eilicient in operation; and to proride such additionai features details of construction as will be described inore 'fully while the lengths of the dilerent turns may be varied for different purposes or conditions, prefer to nialre them in exactly they following manner. rThe first turn onthe `primary coil as indicated at B is tour inches longr so that there will be exactly four inches .Of Wire in the circuit when the Wiper is on Contact No. 1. The length otturns is then increased tour inches for each succeeding tap, for instance, the length of Wire between taps 1 and as indicated at 0 would be eight inches; between taps 2 and 3 as indicated at D would be twelve inches; between taps 3 and 4 as indicated at E Would be sixteen inches; and so on for tlie entire coil, there being 86 taps or contacts for the primary.

The length oi Wire or windings in the secondary coil is three timesl that of the respective windings or coils in the priinzn'ym For instance, the length ot' ivire as shown at lT up to the first tap or Contact would be twelve inches long; between contacts l and 2 as in dicated at G the Wire would be twenty tour inches long; between contacts 2 and 3 as indicated at H the wire would be thirty sii: inches long; between contacts 3 and as indicated at l the Wire would be toi-ty eight inches long, and so on, the secondary .elso

'having 36 tapis or contacts. The Wipers ior the two coils are arranged so that they operate in unison whereby the saine proyxn`- tio-n is maintained between the coils at all times. rlfhe particular apparatus as shown in Figures l and 2 comprises a casingl 6 have ing a flange T at one end which is provided With holes A-or convenience in mountingit in a board or punch Vlhe oppositeend ot the housing; has a covert. it. shaft l() passes through the housingr and is provided with a knob 11 for turning the saine7 such knob being preferably formed in combination with s dial 12 for indicating the position of the Wipers. i

A double spool 13 for suliportinn)` the coils is mounted in the housinga o and is' concentric With the shaft 10. lhis spool is preferably provided with grooves 1/1- and l5 for the respective primary and secondary coils.

This spool' is preferably inede of insulating material such as balrelitep, rubber or the like and has an outwardly,projecting cylindrical iange 16 at one end thereof. A series otI contacts 17 are secured in Ythis Flange in any suitable manner but preferably by being cast therein. These contacts are preieebly lniurled or threaded as shown at 18 for holdingr them in position and their inner vends are preferably Hush With-the inner surface ot the iangel. Their outer ends are provided with grooves 19 for convenience in securing or fastening the turns or taps of the Wire forming the coile thereto @ne end ot the Wire 'forming the primary coil 2O is secured to a contact or bindingr lpost 21 which post may also serve for holding the spool in `position. The first length of four inches as indicated at B in Figure 3 is then Wound around the spool and the Wire is then connected "to the first tap or contact 1'?. The next Windingr of eight inches is then inade and the Wire .attached to the second contact and so on until the taps have been made for the entire 36 contacts.

The spool 13 has a flange 21 on the opposite end tothe flange 16 which is provided with a series of contacts 22 for the secondary coil 23. One end ofl this coil is connected to a binding post 24 and the respective turns or connections are made the same `as with the primary coil with the exception 'that the turns are longer as heretofore described.

Two brushes or wipers 25 and 26 are mounted on the shaft 10 to revolve therewith. These brushes are adapted to make contact with the series of contacts 17 and 22 for the primary and secondary coils respectively. While any suitable Wipers may be utilized, I prefer to use a wiper having a tubular arm 27 for receiving a brush or contact member 28 which has a sliding tit therein and which is pressed outwardly against the contacts by means of a spring 29. rlhe leads from the apparatus to the wiper arms may be made in any suitable manner but it' desired a circuit wire 30 may be connected with a binding post 31 having a contact tinger or brush 32 for engagement withthe shaft 10 for completing thel circuit to the respective wipers 25 and 26.

It will be seen that Whenever the shaft is turned to cut in a number of turns or lengths ot the primary, it will also cut in the saine number of lengths or turns ot' the secondary and the relation between the primary and secondary will remain constant. While the ratio may/be varied, I'have found that the ratio of three to one as heretofore described is a particularly desirable and efficient one. It will of course be noted that the wires in the respective coils are insulated and are bared or stripped wherever necessary for making engagement With the contacts. v

It Will also be noted that various changes vmay be made in the details of construction and arrangement of parts Without departing from the scope of this invention as set forth in the following claims in which I claim:

1. An electrical primary coil having a tap taken oii at a predetermined distance from the end thereof land succeeding taps taken ott at a multiple of said distance, a secondary coil having a tap taken off at a predetermined distance from the end, and succeeding taps taken olf at distances which are always multiples of the corresponding section/of Ithe primary coil, `and mechanically eonnected contacts for engagement with the taps of the respective coils.

2. The combination with a primary coil having taps taken ott at distances which increase in a predetermined ratio, of a secondary coil also having taps taken off at distances which increase in a predetermined ratio, coacting contact members for engagement with the taps of the respective coils G5 and manually operable means for operating said contact members simultaneously.

3. The combination with a primary coil, of a series ot thirty six contacts, said contacts being connected with the coil whereby the coil will be divided into sections which increase in length in a predetermined ratio, a secondary coil, thirty six contacts t'or said secondary coil, said contacts being connected 4 with the coil to provide sections ot' a prede- 75 termined ratio.v cont-act members adapted to engage with the contacts of the primary and secondary coilsn'espectively and means for simultaneously actuating said contact members.

4. In a device of the character set forth. the combination of a casing, a spool mounted in said casing, a primary coil mounted on one end of the spool, contacts for said primary coil, a secondary coil mounted on the other end of the spool, contacts for said secondary coil, a rotatable member passing through the spool and Wipers on said member for engagement with the contacts ofthe respective coils.

5. In a device of the character set forth, the combination with a spool having outwardly projecting flanges at the ends thereof,l avprimary coil mounted at one end ot' the spool, a series of contacts mounted in the adjacent flange and connected by taps with said primary coil, a secondary coil'mounted at the opposite end of the spool, a series of contacts mounted in the adjacent flange and connected by taps with the secondary coil, a shaft passing through said spool and Wipers on saidi shaft for engagement with the contacts of the respective coils for completing electric circuits.

6. Ina radio apparatus, the combinationv of a casing, a spool mounted in said casing and having anges in the ends thereof, a primary coil mounted at one end of the spool, taps for the primary coil secured in the adjacent flange, a secondary coil in the opposite end ot the spool, contact taps for the secondary coil mounted in the adjacent flange, a shaft through said casing and s ring pressed brushes mounted on said sliiaft and Iadapted to engage with said contacts for completing electric circuits.

JACQUES, LE GAUCEAR. 

